||Events which control the execution state of a model or collection of scapes.
||A listener to an agent scape.
||User: jmiller Date: Jun 12, 2006 Time: 1:21:05 PM To change this template use
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||An event describing some change in scape state.
||Manages the relationship between a listener and its scape, including listener
registeration and managing calling appopriate view methods for scape events.